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UPDATE Per the author, a devtools::install_github("hadley/devtools") should take care of everything you need prior to installing the latest dplyr (though I did not have postgres libs installed and suspect that might still be needed).
The R dplyr package just turned 0.3 and to get it working in my development environment (OS X Mavericks) I had to do the following:
brew install postgresql...

What are joint models for longitudinal and survival data?
In this post we will introduce in layman's terms the framework of joint models for longitudinal and time-to-event data. These models are applied in settings where the sample units are followed-up in time, for example, we may be interest in patients suffering...

The arrival of the autumnal equinox foreshadows the reality of longer nights and shorter days here in the northeast US. We can both see that reality and distract ourselves from it at the same time by firing up RStudio (or your favorite editor) and taking a look at the sunrise & sunset times based on

I love dplyr. It's my "go-to" package in R for data exploration, data manipulation, and feature engineering. I use dplyr because it saves me time: its performance is blazing fast on data frames, but even more importantly, I can write dplyr code faster ...

testthat 0.9 is now available on CRAN. Testthat makes it easy to turn the informal testing that you’re already doing into formal automated tests. Learn more at http://r-pkgs.had.co.nz/tests.html This version of testthat has four important new features that bring testthat up to speed with unit testing frameworks in other languages: You can skip() tests with

We leave the Jolly Roger behind this year and turn our piRate spyglass towards the digital seas and take a look at piRated movies as seen through the lens of TorrentFreak. The seasoned seadogs who pilot that ship have been doing a weekly “Top 10 Pirated Movies of the Week” post since early 2013, and...

I built an interactive Shiny application that uses simulated annealing to solve the famous traveling salesman problem. You can play around with it to create and solve your own tours at the bottom of this post. Here's an animation of the annealing process finding the shortest path through the 48 state capitals of the contiguous...

Well, not that you really probably want to know how to say such an absurdly large number. However for those of you who are interested (allowing for rounding) it is:one quintillion, three hundred forty quadrillion, one hundred sixty-four trillion, one h...

For those of us interested in reproducible analysis, Rmarkdown is a great way of communicating our code to other researchers. Rstudio, in particular, makes it very easy to create attractive HTML document containing text, code, and figures, which can then be sent to colleagues or put on the internet for anyone to see. If you aren't using...